<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片 -->
    <!-- 添加角色区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolesList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 一级权限 -->
              <el-col :span="5">
                <el-tag
                  @close="removeRightById(scope.row, item1.id)"
                  closable
                  >{{ item1.authName }}</el-tag
                >
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 二级权限 -->
              <el-col :span="19">
                <!-- 通过for循环，嵌套渲染二级 -->
                <el-row
                  :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      @close="removeRightById(scope.row, item2.id)"
                      closable
                      >{{ item2.authName }}</el-tag
                    >
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 三级权限 -->
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="(item3, i3) in item2.children"
                      :key="item3.id"
                      @close="removeRightById(scope.row, item3.id)"
                      closable
                      >{{ item3.authName }}</el-tag
                    >
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>{{scope.row}}</pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column prop="roleName" label="角色名称"></el-table-column>
        <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button
              type="primary"
              size="small"
              icon="el-icon-edit"
              @click="handleEdit(scope.$index, scope.row)"
              >编辑</el-button
            >
            <el-button
              type="danger"
              size="small"
              icon="el-icon-delete"
              @click="handleDelete(scope.$index, scope.row)"
              >删除</el-button
            >
            <el-button
              type="warning"
              size="small"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)"
              >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <el-tree
        :data="rightsList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys= "defKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allowRights"
          >确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色的列表
      rolesList: [],
      // 分配权限的对话框的显示或隐藏
      setRightDialogVisible: false,
      rightsList: [],
      // 树形控件
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中节点ID
      defKeys: [],
      // 当前编辑的角色的ID
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取所有的角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.rolesList = res.data
      console.log(res)
    },
    // 通过id删除相应的权限
    async removeRightById(role, rightId) {
      // 弹框是否需要删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch((res) => res)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 发送请求删除用户权限
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      this.$message.success('删除成功')
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限树失败')
      }
      // 把获取到的数据保存到data中
      this.rightsList = res.data
      // 递归获取3级节点
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归将3级节点下的所有节点的id取出
    getLeafKeys(node, arr) {
      // 如果当前节点不包含children属性，则说明是叶子节点
      if (!node.children) {
        return arr.push(node.id)
      }
      // 如果包含children属性，则说明不是叶子节点
      node.children.forEach((item) => {
        this.getLeafKeys(item, arr)
      })
    },
    // 当关闭分配权限的对话框时，清空数据，防止数据污染
    setRightDialogClosed() {
      this.defKeys = []
    },
    async allowRights() {
      const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()]
      const idStr = keys.join(',')
      // 发起网络请求
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, {
        rids: idStr
      })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 10px;
}

.bdtop {
  border-top: 1px solid #ebeef5;
}
.bdbottom {
  border-bottom: 1px solid #ebeef5;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
